Tasmania's Lower House is preparing to debate a bill to allow terminally ill patients to end their lives.

The bill's authors Premier Lara Giddings and the Greens leader Nick McKim need 13 votes to send the legislation to the Upper House.

The ABC understands they don't have the numbers.

All 10 Liberal MPs will vote no, along with Labor members Michael Polley, Brenton Best and the Attorney-General Brian Wightman.

But Mr McKim is still optimistic.

"I'm not going to predict how this might go except to say that I reckon it is going to be a very close outcome," he said.

Labor backbencher Graeme Sturges isn't saying how he will vote.

He opposed voluntary euthanasia in the 2009 Parliamentary debate.

Anti-abortion campaign 'distasteful'

Overseas anti abortion campaigners are targeting Tasmanian politicians ahead of a vote on the proposed legislation, due later this year.

State MPs are considering laws which would remove abortion from the criminal code, allowing women to terminate their pregnancies at up to 16 weeks on the advice of a doctor.

Some have been inundated with disturbing anti abortion material, including foetus dolls and graphic photos of dead babies.

The Australian Christian Lobby's Lyle Shelton has told 730 Tasmania sending such material to try to sway MPs is fair enough.

"Look I think people should be free to advocate on this issue," he said.

" I have seen those representations of unborn babies and I think it's a legitimate educative tool to help all of us in the community to understand just what the unborn child looks like, it's not a blob of foetal tissue."

Murchison Upper House MP Ruth Forrest supports the proposed legislation and has condemned the anti abortion campaigners for sending in offensive material.

"It is a pretty low act, if you have an opposition to termination, there is a way to express it without using that sort of material," she said.

A parliamentary report on the proposed law change is due to be handed down later this year.

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